I don’t know but the Great Ormond Street Hospital may not like being upstaged by the Yanks.
Brits are too busy denouncing Charlie’s parents for wanting to use him as a guinea pig to comprehend medical research. (Maybe not all Brits but from what I’ve seen, far too many.)
IMHO, it’s not that they (British health establishment) don’t think the procedure could work — they fear that it might work. (It’s expensive & socialized health care requires rationing — and banning expensive new treatments. That’s the only way budgets can be balanced.)
British medical research budget
“In 2015/16 the MRC’s gross research expenditure, funded by our BIS budgetary allocation and contributions from other bodies, was £927.8m compared to £771.8m in 2014/15. “
https://www.mrc.ac.uk/about/what-we-do/spending-accountability/facts/
The US federal government:
“Federal agencies invested a total of $35.9 billion, with the National Institutes of Health accounting for $29.6 billion”
https://www.researchamerica.org/sites/default/files/2016US_Invest_R%26D_report.pdf
Adding in private and university research spending, and the 2015 total was $158.7 billion
The UK’s research spending is relatively insignificant.